Influence of Carbon Dioxide. I V. 
4 87 
Literature cited. 
1. Kidd, F. : The Controlling Influence of Carbon Dioxide in the Maturation, Dormancy, and 
Germination of Seeds. Part I. Roy. Soc. Proc., B., vol. lxxxvii, 1914. 
2. : The Controlling Influence of Carbon Dioxide in the Maturation, Dormancy, and 
Germination of Seeds. Part II. Roy. Soc. Proc., B., vol. lxxxvii, 1914. 
3. Crocker, W. : Mechanics of Dormancy in Seeds. American Journ. of Bot., vol. iii, No. 3, 1916. 
4. Kidd, F. : The Controlling Influence of Carbon Dioxide. Part III. Roy. Soc. Proc., B., 
vol. lxxxix, 1915. 
5 . Crocker, W., and Davis, W. E. : Delayed Germination in Seed of Alisma Plantago. Bot. 
Gaz., vol. lviii, 1914. 
6. Muller, G. : Beitrage zur Keimungsphysiologie : Untersuchuttgen fiber die Sprengung der 
Samen- und Fruchthiillen bei der Keimung. Pringsh. Jahrb. f. wiss. Bot., Bd. liv, 1915. 
7. Crocker, W. : Role of Seed-coats in Delayed Germination. Bot. Gaz., vol. xlii, 1906. 
8. Shull, C. A. : The Oxygen Minimum and the Germination of Xanthium Seeds. Bot. Gaz., 
vol. Iii, 1911. 
9 . Rose, D. H. : A Study of Delayed Germination in Economic Seeds. Bot. Gaz., vol. lix, T915. 
10. Atwood, W. M. : A Physiological Study of the Germination of Avena fatua . Bot. Gaz., 
vol. lvii, 1914. 
11. Eckerson, S. H. : A Physiological and Chemical Study of After-ripening. Bot. Gaz., vol. 
I 9 I 3* 
12. Lehmann, E. : Ueber katalytische Lichtwirkung bei der Samenkeimung. Biochem. Zeitschr., 
Bd. 1, 1913. 
13. Holfert, J. : Die Nahrschicht der Samenschalen. Flora, Bd. lxxiii, 1890. 
14. Schroeder, J. : Untersuchung der Samen der Brassica- Alien und Varietaten. Landvv. 
Versuchs-Stationen, Bd. xiv, 1871. 
DESCRIPTION OF FIGURES ON PLATE XXIII. 
Illustrating Dr. Kidd and Mr. West’s paper on the Controlling Influence of Carbon Dioxide. 
Fig. 1. A & B. Eight embryos from dormant seeds photographed four days after removal of 
the seed-ccats ; four ungerminated. 
b 2 . The same four embryos photographed four days later, showing healthy development of 
the radicle. 
Fig. 2. A & B. Twelve embryos from dormant seeds photographed eight days after removal of 
the seed-coats ; five ungerminated. 
B 2 . The same five embryos photographed three days later; one still ungerminated. 
